Calculating-machine.



PATBNTED PEB. 18, 1908.l

y No. $219,204.

' G. J. SMITH.

GALGULATING MACHINE.

2 SHEETS-SHEET APPLICATION FILED APE.1, 1907.

' PATBNTED PEB.18, 1908.

G. J. SMITH. GALGULATING MACHINE.

APPLICATION FILED AFR. 1, 1907.

A2 SHEETS-SHEET 2.

.nection with the accompanying' drawings, ,is

is a side elevation of the index g the index rod CHESTER J. SMITH, OF.TAMESTOWN, NEW YORK.

cALoULATrN-MACHINE.

Specication .of Letters Patent.

Patented Feb. 18, 1908.

Application filed April l. 1907. Serial No. 365.734.

To all whom it may concern:

Be it known that I, CHESTER J. SMITH, a citizen of the United States,residing at Jamestown, in the county of Chautauqua and State of NewYork, have invented new and useful Improvements in Calculating-Machines, of which the following, taken in cona full, clear, and exactdescription.

The invention relates to calculating machines, more particularlyforcalculating wages, or interest-or the price of a commodity; and theobjects of the invention are first, to provide a simple mechanismv whichis cheap to manufacture, in which for example the table showing the rateper hour and those showing the fractions of an hour may be brought intosuch conjunction that the amounts may be simultaneousljyT read from thetwo tables; and second, to provide means whereby the adjoining figuresin the tables are covered from sight to prevent error, so that only thecorrect amount at the prescribed rate is readable.

In the drawings, Figure 1 is a perspective view of the machine withcertain portions of the case broken away in order to show a portion ofthe tables and operating mechanism.

ig. 2 is a crosswise sectional view of the ma chine. Fig. 3 is an endview of the two rolls showing the intermeshing gears and the spring dogwhich controls the large roll, Fig.v 4 is an enlarged view of a sectionvof the case, showing the form of holder for the rate numbers and thedepression for the index rod. Fig. 5 is a plan view of the index; andFig. 6

and case underneath in section.

Similar numerals refer to parts in the several views.

, The numeral 1() indicates the case which is preferably made of sheetmetal in substantially cylindrical form with cast metal ends 11 whichare so formed as, to provide suitable supports for the case and alsorevolubly support the'rods 12 and 13 upon which the rolls or cylinders14 and 15 aremounted within case 10. The rolls or cylinders are madehollow and have suitable disk shaped ends to the index being showncorresponding mount the cylinders 14 and 15 on rods 12l and 13. A handwheel 16 is provided on the end of rod 12 and a knob 17 on the end ofrod 13 in order to turn the same.

One end of each of the cylinders 14 and 15is provided with intermeshingteeth or gears 18 and 19, as shown in Figs. 1 and 3; the teeth being ofsuch size as to move the cylinder exactly one line of numerals. Thus,for example, the numerals, as shown are for hours on cylinder 14, andfor fractions of an hour on cylinder 15. Consequently teeth 18 and 19should be of such a size as to correspond to the size of the numerals sothat cylinder 14 will stop exactly lon the hour and cylinder 15 on eachfive minute fraction of an hour. A spring ratchet 20 is provided withinthe upper side of the case 10 having a roller to engage teeth 18, saidroller working easily backward or forward over the rounded ends of teeth18. Ratchet 20 stops the cylinder 14 exactly on the hour.

A lengthwise slot 21 is provided on the front side of the case l() toreveal the amounts in the table for each consecutive number of hours,which table is placed on the outer side of cylinder 14, the hours beingplaced at the center and the computations according to the rate per hourbeing arranged horizontally on each side of the number of hours.

A flanged holder 22 is attached to the case immediately below andadjacent to slot 21 to receive -,the rate slip. It is preferably placed'below instead of above the slot 1n order that it-shall not cast ashadowover the numerals in slot 21 and also to lbe more easily readable,as hereinafter set forth. T he different rates per hour are placed upona strip of paper which is slipped into holder 22 so that the rates arein line with and close to the amount for any given number of hours.

A slot 23 is provided in case 10 in front of roll 15 parallel to slot21, to be used in relation to roll 15 in the same manner as slot 21 isused in relation to roll 14. A rod 24 is provided mid-way between slots21 and 23, and upon rod 24 an index 25 is slidably mounted so that theindex may be slipped back and forth from one end .to the other of therolls. The upper end of the index 25 slides under the edge of case 10adjacent to slot 21.

i reading glasses 'fr0 'made of suiicient clength to allow 50 17, andwheel 16 is then turned until attained on roll 14.

cc hours appearsin slot 21.

Index is an important part oi 'my invention. lt is made sul'hcientlybroad to allow an opening 26 therein of sufficient length to take in theamounts on roll 1a. A

o similar opening 27 is provided lor the rate i opening the lower end,Winch is oney numerals in rate holder 22, and 28 is provided at half thesizeof opening 26, and is placed in line with the right end of openings26 and 27 cent, column; since the amount for the fraction of an hourwould not reach above the dollar mark. Openings 26, 27 and 28 arepreferably filled with suitable magnifying or to easily read the smalliigures which are necessary in such a table in order'to diminish theJize of rolls 14 and 15. Index 25 is made sufficiently Wide also tocover `the numerals each side of the openings 2o 25, 27 and 2S, therebypreventing error. y

To use my device, the accountant slides index 25 on rod 24 to the rateper, hour desired, which rate Will show through opening 27. l-le thenturns the cylinders to the de- 25 sired number of hours and fraction ofan lie then reads the amount in opening n hour. l 26 and adds to it thenumber oi cents shown in opening 28 which gives hint ther exact amountfor the number of hours and fraction 3o of an hour, provided he hasturned the cylinders 14 and 15l correctly. A. small knob 29 is providedon index 25 for the easy handling of the same.

in order4 to uicldy turn the cylinders 11i and 15 to the esired point,they are geared turned independent of the other While thus held out. ofmesh. ln order to quickly adjust the rolls, however, it is foundexceedingly convenient to hold the rolls in mesh by pressingagainstspring 31 by means of knob the desired number of hours is attained ornearly Willen it is apparent l l l le and being one-hali the size coversonly the l that Athe roll is nearing this point, the small I roll 15,which has probably made a number of revolutions in the turning of thebigroll, is

released from contact with the big` roll as said small roll approachesthe fractional amount desired. The turning el the large roll iscontinued until the desired number of lt is only necesoi" hours to saryto cause the desired number number of appear in slot 21 and the desiredminutes to appear in slot 23 and to slide index lubly mounted in saidcase,

sraaoe 25 to the desired rate in order to read the exact amount nue forthe number' ol' hours plus the number ol cents lor the minutes, tocalculate the exact amount lor a given time.

lt is apparent that interest may easily be calculated upon my device byplacing a table with the number ol days and ciimputations .on tlulargcwheel, the interest rates being placed in the holder 22, and the monthsand computations being placed on the smaller roll 15. .it is alsoobvious that the computation ofthe selling or cost price of com'modities by the pound or by the yard may be greatly accelerated by theuse of my device. As, for example, the cost of coal er ton vmay becomputed by placing the ta le upon roll 14 extending Jfrom one pound toone hundred and placing the number of hundred pound computation on thesmall roll 15, the different rates per ton being placed in the rateholder 22, then by sliding index 25 along rod 24, until opening 27 isover the desired rate per ton, and turning the cylinders 14 and 15 untilthe number of hundred pounds and fractions. of a hundred are 'readablein the openings 25 and 28, thereby giving the com putation at once andgreatly aiding in the quick calculation of such sales'.l it is alsoaparent that additional rolls may be added with additional slotstherefor in case 1G Where it is desired to handle a greater number offractional parts in the computation, it only being necessary to provideadditional openings in index 25, the ollice of the index 25 being tobring the desired computations into quick relation one to the other sothat they may be added together.

l claim as neWz- 1. ln a calculating machine, a case having parallelslots therein, cylinders revolubly mounted in said case opposite saidslots, computations arranged in annular and horizontal lines on `saidcylinders, an index slidably mounted in saidcase having openingsopposite said slot, gear teeth on said cylinders, said cylindersresiliently held apart to be pressed into gear when desired. f

2. ln a calculating machine, a case having lengthwise parallel slots',cylinders revolubly mounted in said case opposite said slots, gears onsaid cylinders and a spring to hold said gears out of mesh, computationsarranged on said cylinders in series corresponding to said slots, a rodon said case'between and parallel to said slot, a price holder on saidcase betivecn and parallel to said slots, an index slidably mounted onsaid rod and extending over said price holder and'slots, said indexhaving openings o )posite said slots and price holder, substantially asand for the purpose specified.

3. ln a calculating machine, a case 10 hav-` ing slots 21 and 23,cylinders 14 and 15 revokn'obs 16 and 17 for turning said cylinders,hour oomputal said gears out of mesh, substantially as and 1G tions onvthe le'rge Wheel and minute oompufor the purpose specified.

tations on the'srnall Wheel in'annular and n testimony whereof havesigned my horizontal lines, price holder 22 on said case, i name to thisspecification in the presence of an indeX 25 sldably mounted on rod 24in I two subscribing Witnesses. 1 said case, said index having openings26 27'; CHESTER J. SMITH. and 28 opposite said slots and price holdnf; lWitnesses: gears 18 and 19 on said cylinders, a slot 30 in I. A.ELLsWoRTH,

' said case, and a'spring 31 on said case to hold A. W. KETTLE.

